Construction method of multi floor building

ABSTRACT

In the construction method of a multi floor building, non load bearing walls which are made from pre-cast concrete and are erected upon edge portions of the floor slabs, are formed of a height which is roughly equal to the height of each floor of the building. The non load bearing wall for an upper floor is elected upon the non lead bearing wall which has been erected upon the floor slab for a lower floor. A floor slab shuttering for the upper floor is built at the inner side of the non load bearing wall for the upper floor and at the partway in the vertical direction of the non load bearing wall for the upper floor, with the non load bearing wall forms a portion of the shuttering, and concrete is poured within this floor slab shuttering to construct the floor slab for the upper floor.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a construction method of a multifloor building, and more particularly relates to a construction methodof a multi floor building in which non load bearing walls such asbalustrades or the like which are made from pre-cast concrete areprovided at the edges of the floor slabs for each floor, and to a nonload bearing wall of a multi floor building of the above type. Priorityis claimed on Japanese Patent Application No. 2003-170806, filed Jun.16, 2003, the content of which is incorporated herein by reference.

[0003] 2. Description of the Related Art

[0004] Conventionally, such as the one shown by way of example in FIGS.33 through 41, have been proposed as methods for construction of a multifloor building in which a non load bearing wall, for example abalustrade, which is made of pre-cast concrete is provided at the edgeof a floor slab (for example, refer to Japanese Patent Application,First Publication No. 2002-371519).

[0005] The multi floor building which is shown in these figures is onewhich has a structure in which a vacant portion P which is used as aparking area or the like is provided in a first floor portion beneaththe floor slab S for the lowest inhabitable floor of the building (whichis the second floor thereof). As non load bearing walls which will bedescribed hereinafter, balustrades which are made from pre-cast concreteare provided at edge portions on both sides of the floor slab S, and thefloor slabs and balustrades are made in multiple layers. In other words,if this bottommost floor slab S is designated as S(S1), further floorscomprising floor slabs S(S2), S(S3), . . . and corresponding balustradesare provided in additional layers above this bottommost floor.

[0006] Furthermore, a construction method of the multi floor buildingwill be explained with reference to the abovementioned figures.

[0007] First, as shown in FIG. 33, in order to define the vacant portionP, a plurality of columns 2 are erected upon a foundation 1 which hasbeen laid in the ground G, and, after having assembled shuttering 3 formaking the floor slab S upon these columns 2, the floor slab S1 for thelowest floor (the second floor portion of the building) is constructed,as shown in FIG. 34, by arranging reinforcing bars (not shown in thefigures) in this shuttering 3 and by pouring concrete C thereinto, andby subsequently removing said shuttering 3 at a time when this concretehas hardened sufficiently to reach a predetermined strength.Furthremore, the reference symbol J in FIG. 33 denotes shoring forsupporting said shuttering 3.

[0008] One of the two side portions of the floor slab S1 which has beenmade in this manner is destined to constitute the floor of a passagewayD, while the other is destined to constitute the floor of a verandah E;and its central portion is destined to constitute the floor of a livingspace F.

[0009] Next, as shown in FIG. 34, wall panels 4 which are made frompre-cast concrete are erected as load bearing walls at the portions ofthe living region F where it borders upon said passageway D and saidverandah E, and thereby said living region F is delimited, as shown inFIG. 35.

[0010] These wall panels 4 have been manufactured in advance in afactory or the like, and, after having been transported to the placewhere this building is to be constructed, are set in predeterminedpositions upon the floor slab S1 by using a crane or the like, and arefitted to the floor slab S1 by using a suitable connection method.

[0011] Furthermore, as shown in FIGS. 35 and 36, balustrades 5 which aremade from pre-cast concrete, and which constitute non load bearingwalls, are built upon both the edges of the floor slab S1, and therebythe construction of the lowest floor of the building is completed.

[0012] The erection of these balustrades 5 is performed by the samemethod as the erection of the previously described wall panels 4, andthe setting up of these wall panels 4 and these balustrades 5 isperformed over the entire extent of this floor slab S1 for the secondfloor portion.

[0013] Next, as shown in FIG. 36, upon this floor slab S1 for the secondfloor portion which has thus been constructed, the shuttering 3 formaking the floor slab for the floor directly above (the third floorportion of the building) are set up by using large amounts of shoring Jand the wall panels 4 which are previously erected as to function assupport members. And then, after arranging reinforcing bars within thisshuttering 3, as shown in FIG. 37, concrete is poured thereinto, so thatthereby the construction of the floor slab S2 for the third floorportion of the building is completed.

[0014] After this, upon this floor slab S2 for the third floor portionof the building which has thus been constructed, as shown in FIG. 38,wall panels 4 are erected, and thereafter, as shown in FIGS. 38 and 39,balustrades 5 are made, and hereby the third floor portion of thebuilding is completed.

[0015] Furthermore, upon this floor slab S2 for the third floor portionwhich has thus been constructed, the shuttering 3 for the fourth floorportion of the building are set up by using large amounts of shoring Jand the wall panels 4 which are previously erected as to function assupport members, as shown in FIG. 40. And then, by repeating theprocesses as described above for upper floors, multi floor building isconstructed.

[0016] However, with this conventional construction method describedabove, there remain the following problems to be solved.

[0017] First, with this conventional construction method, the floor slabS is constructed first, and the wall panels 4 and the balustrades 5 formounting upon this floor slab S are made subsequently in order. However,when performing the work of building these wall panels 4 and balustrades5 upon the floor panel S, as shown in FIG. 38 for the third floorportion of the building by way of example, the surrounding edge portionof this floor panel S is open, and, since this is a situation in whichno safeguard is provided. Accordingly, it is necessary to take verygreat care for ensuring safety.

[0018] Furthermore, in particular, when building the balustrades, thejoints 6 between these balustrades and the floor slab S are made alongthe entire lengths of the balustrades 5 in the longitudinal direction,as shown in FIG. 41, and the work involved in the finishing processingfor these joints 6 and in their waterproofing processing and so on mustbe performed as work on the outer side of the balustrades 5.

[0019] When this work is to be performed from above the floor slab S, itis necessary to perform it while leaning towards the outside over theupper edges of said balustrades 5, and not only is the workability ofsuch a procedure very poor, but it is not desirable from the point ofview of safety.

[0020] Furthermore, as shown in FIG. 37, the work of fitting togetherthe shuttering 3 for the floor slab S of the next higher floor is workwhich must be performed at a level which is higher than the balustrades5 which have already been built, and moreover, there is no safeguard forthe the worker, as previously described. Accordingly, it is necessary totake great precautions for ensuring safety.

[0021] Even further, since the height of the region in which the work isbeing performed increases along with the progress of the work to higherfloors. Accordingly, the precautions against accident which must betaken become steadily greater.

[0022] In the conventional construction method, as shown in FIG. 40, assuch a type of precaution against accident, it is sometimes practiced toerect constructional scaffolding I at the side of the building, so as toperform the previously described building of the balustrades 5 and theprocessing work for the joints 6, and also the assembly work for theshuttering 3 for the next floor of the building, from upon thisconstructional scaffolding I.

[0023] However, with the use of the constructional scaffolding I, thewidth of treadboards, which are the regions where the worker must workand must move to and fro, is narrow. Furthermore, since reinforcementmembers for support columns which support the treadboards inevitablyproject onto the treadboards, the regions for working and for moving ofthe worker become even narrower. As a result, the problems remain to besolved that the activities of the worker are restricted, and also thatthe smoothness of their movements to and fro is reduced.

[0024] The present invention has been conceived in the light of theabove described problems, and it takes as its objective to provide aconstruction method of a multi floor building, with which theconstructional efficiency is excellent, along with enhancing the safetyfor working and for moving of the worker.

SUMMARY OF THE INVENTION

[0025] In order to solve the problems described above, the first processaccording to the present invention is a construction method of a multifloor building which comprises floor slabs which define each floor ofthe multi floor building, and non load bearing walls made from pre-castconcrete which are erected upon edge portions of the floor slabs,wherein the non load bearing walls are formed of a height which isroughly equal to the height of each floor of the multi floor building,and, after having erected the non load bearing wall for an upper floorupon the non lead bearing wall which has been erected upon the floorslab for a lower floor, a floor slab shuttering for the upper floor isbuilt at the inner side of the non load bearing wall for the upper floorand at the partway in the vertical direction of the non load bearingwall for the upper floor, with the non load bearing wall serving as aportion of the shuttering, and concrete is poured within this floor slabshuttering so as to construct the floor slab for the upper floor of thebuilding.

[0026] The second construction method of a multi floor buildingaccording to the present invention is distinguished in that, in theabove described first construction method, before erecting the non loadbearing wall for the upper floor, load bearing walls are erected uponthe floor slab for the lower floor so as to define rooms upon the lowerfloor.

[0027] The third construction method of a multi floor building accordingto the present invention is distinguished in that, in the abovedescribed first or second construction method, connection reinforcingbars which project into the floor slab shuttering for the upper floorare provided to the non load bearing wall for the upper floor, and thenon load bearing wall for the upper floor and the floor slab for theupper floor are joined together by embedding these connectionreinforcing bars in the concrete which is poured into the floor slabshuttering for the upper floor.

[0028] The fourth construction method of a multi floor buildingaccording to the present invention is distinguished in that, in any oneof the above described first through third construction method, at thejoining portion between the upper and lower non load bearing walls, ametallic sleeve which extends along the direction of their mutualconnection is embedded within either one of these non load bearingwalls. Furthermore, a connection reinforcing bar which is inserted intothe metallic sleeve is projected into the other one of these non loadbearing walls, and the upper and lower non load bearing walls areconnected together by, after having inserted this connection reinforcingbar into the metallic sleeve, filling grouting material into themetallic sleeve and allowing it to harden.

[0029] The fifth construction method of a multi floor building accordingto the present invention is distinguished in that, in any one of theabove described first through fourth construction method, before pouringconcrete into the floor slab shuttering for the upper floor, the nonload bearing wall for the upper floor which constitutes a portion ofthis floor slab shuttering for the upper floor is connected to astructural element which is positioned on the inner side thereof.

[0030] The sixth construction method of a multi floor building accordingto the present invention is distinguished in that, in the abovedescribed fifth construction method, the structural element is the floorslab for the lower floor.

[0031] The seventh construction method of a multi floor buildingaccording to the present invention is distinguished in that, in theabove described fifth construction method, the structural element is aload bearing wall which is erected upon the floor slab for the lowerfloor.

[0032] The eighth construction method of a multi floor buildingaccording to the present invention is distinguished in that, in any oneof the above described first through seventh construction method, thenon load bearing wall is a balustrade.

[0033] Furthermore, the first non load bearing wall for a multi floorbuilding according to the present invention is a non load bearing wallmade from pre-cast concrete which is erected at an outer edge portion ofa floor slab of a multi floor building, which has a height roughly equalto the height of each floor of the multi floor building, and on which,moreover, a floor slab shuttering for the corresponding floor is builtat the inner side of the non load bearing wall and at the partway in thevertical direction of the non load bearing wall, and the non loadbearing wall constitutes a portion of the floor slab shuttering.

[0034] The second non load bearing wall for a multi floor buildingaccording to the present invention is the above described first non loadbearing wall, distinguished in that a blind portion which hides theupper portion of the outer edge portion of the floor slab projects atleast upward from the floor slab at the portion where the floor slabshuttering for the corresponding floor.

[0035] The third non load bearing wall for a multi floor buildingaccording to the present invention is distinguished in that, in theabove described second non load bearing wall, joining wall portionswhich extend in the downward direction of the floor slab are formed atthe lower portions of both the ends in the widthwise direction of theblind portion.

[0036] The fourth non load bearing wall for a multi floor buildingaccording to the present invention is distinguished in that, in theabove described second non load bearing wall, joining wall portionswhich extend in the upward direction from the blind portions are formedat the upper portions of both the ends in the widthwise direction of theblind portion.

[0037] The fifth non load bearing wall for a multi floor buildingaccording to the present invention is distinguished in that, in theabove described third or fourth non load bearing wall, a connectingblock for joining together the upper and lower non load bearing walls isprovided by dividing each of the joining wall portions in the verticaldirection.

[0038] The sixth non load bearing wall for a multi floor buildingaccording to the present invention is distinguished in that, in any oneof the above described first through fifth non load bearing walls, thenon load bearing wall is a balustrade.

[0039] According to any of the above described first through eighthprocesses for construction of a multi floor building of the presentinvention, the non load bearing walls are formed of a height which isroughly equal to the height of each floor of the multi floor building,and, after having erected the non load bearing wall for an upper floorupon the non lead bearing wall which has been erected upon the floorslab for the lower floor, a floor slab shuttering for the upper floor isbuilt at the inner side of the non load bearing wall for the upper floorand at the partway in the vertical direction of the non load bearingwall for the upper floor, with the non load bearing wall serving as aportion of the shuttering, and concrete is poured within this floor slabshuttering so as to construct the floor slab for the upper floor of thebuilding; and accordingly, the following excellent beneficial resultsare obtained.

[0040] Since, before performing the construction of the upper floor ofthe building, it is possible to erect the non load bearing wall which issupported by the lower structure of the building which has previouslybeen made, on the edge portion of the working region of the upper floor.Accordingly, it is possible to utilize this non load bearing wall as aprotective fence for the working region for making the upper floor. As aresult, along with it being possible to prevent objects falling from theedge portion of the working region, also it is possible to ensure thesafety of the workers while they are working in this working region, andwhile they are moving therein.

[0041] Furthermore, by utilizing the non load bearing wall as a portionof the floor slab shuttering, the work of making this floor slabshuttering for the edge of the floor slab becomes unnecessary.Accordingly, it is possible to arrange that almost all of the work forconstructing each floor of the building is work upon the inside of thenon load bearing walls, in other words, is work upon the inside of thebuilding which is being constructed. As a result, it is possible todispense with the constructional scaffolding which was necessarily setup outside the main body of the building in the prior art.

[0042] Moreover, according to any of the above described first throughsixth non load bearing walls for a multi floor building of the presentinvention, since this wall has a height roughly equal to the height ofeach floor of the multi floor building, and the floor slab shutteringfor forming the floor slab for the corresponding floor is made partwayalong its height direction and the non load bearing wall serve as aportion of this floor slab shuttering, it is possible easily to form theprotective fence for the working region when implementing the previouslydescribed processes for construction of a multi floor building of thepresent invention.

[0043] In particular, according to either of the above described thirdand fourth non load bearing walls for a multi floor building of thepresent invention, it is possible to ensure good lighting for the lowerfloor by forming joining wall portions which extend in the downwarddirection of the floor slab of the corresponding floor at the lowerportions of both the ends in the widthwise direction of the blindportion of the above described second non load bearing wall, and bymaking an opening portion between the floor slabs for the upper andlower floors.

[0044] Furthermore, according to the fifth non load bearing wall for amulti floor building of the present invention, in the joining wallportion of the above described third or the fourth non load bearingwall, the connecting block for joining the upper and lower non loadbearing walls is provided by dividing each joining wall portion in thevertical direction; and thereby it is possible to reduce the height ofthis non load bearing wall during transportation.

BRIEF DESCRIPTION OF THE DRAWINGS

[0045]FIG. 1 is an elevation view of a portion of a multi floorbuilding, showing a first preferred embodiment of the present invention.

[0046]FIG. 2 is a sectional side view of a portion of the multi floorbuilding, showing this first preferred embodiment of the presentinvention.

[0047]FIG. 3 is an external perspective view of a balustrade, showingthis first preferred embodiment of the present invention.

[0048]FIG. 4 is an enlarged vertical sectional view showing this firstpreferred embodiment of the present invention, and showing the state ofa balustrade for an upper floor and a balustrade for a lower floorbefore they are connected together.

[0049]FIG. 5 is an enlarged vertical sectional view showing this firstpreferred embodiment of the present invention, and showing the state ofthe balustrade for the upper floor and the balustrade for the lowerfloor when they have been connected together.

[0050]FIG. 6 is an enlarged vertical sectional view showing a procedurefor construction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0051]FIG. 7 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0052]FIG. 8 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0053]FIG. 9 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0054]FIG. 10 is a vertical sectional side view showing this procedurefor construction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0055]FIG. 11 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0056]FIG. 12 is a vertical sectional side view showing this procedurefor construction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0057]FIG. 13 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0058]FIG. 14 is a vertical sectional side view showing this procedurefor construction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0059]FIG. 15 is an elevation view showing this procedure forconstruction of a multi floor building to which the first preferredembodiment of the present invention has been applied.

[0060]FIG. 16 is an elevation view showing a procedure for constructionof a multi floor building to which a second preferred embodiment of thepresent invention has been applied.

[0061]FIG. 17 is an elevation view showing a portion of a multi floorbuilding to which the second preferred embodiment of the presentinvention has been applied.

[0062]FIG. 18 also illustrates this second preferred embodiment of thepresent invention, and shows an enlarged vertical sectional view of thesituation before an upper portion balustrade and a lower portionbalustrade and a connecting block have been connected together.

[0063]FIG. 19 illustrates this second preferred embodiment of thepresent invention, and shows an enlarged vertical sectional view of thesituation when the upper portion balustrade and the lower portionbalustrade and the connecting block have been connected together.

[0064]FIG. 20 is an external perspective view showing a variant of thesecond preferred embodiment of the present invention, and shows theportion at which the upper portion balustrade and the lower portionbalustrade and the connecting block are connected together.

[0065]FIG. 21 is an external perspective view showing a variant of thesecond preferred embodiment of the present invention, and shows theportion at which the upper portion balustrade and the lower portionbalustrade and the connecting block are connected together.

[0066]FIG. 22 is an external perspective view showing a variant of thesecond preferred embodiment of the present invention, and shows thesituation before the upper portion balustrade and the lower portionbalustrade and the connecting block have been connected together.

[0067]FIG. 23 is an enlarged vertical sectional view showing a variantof the second preferred embodiment of the present invention, and showsthe situation before the upper portion balustrade and the lower portionbalustrade and the connecting block have been connected together.

[0068]FIG. 24 is an enlarged vertical sectional view showing a variantof the second preferred embodiment of the present invention, and showsthe situation while the upper portion balustrade and the lower portionbalustrade and the connecting block are being connected together.

[0069]FIG. 25 is an enlarged vertical sectional view showing a variantof the second preferred embodiment of the present invention, and showsthe situation when the upper portion balustrade and the lower portionbalustrade and the connecting block have been connected together.

[0070]FIG. 26 shows another variant of the second preferred embodimentof the present invention, and is an external perspective view of aconnecting block.

[0071]FIG. 27 is an enlarged vertical sectional view showing anothervariant of the second preferred embodiment of the present invention, andshows the situation during formation of the connecting block.

[0072]FIG. 28 shows another variant of the second preferred embodimentof the present invention, and is an external perspective view of aconnecting block.

[0073]FIG. 29 is an exploded perspective view showing a third preferredembodiment of the present invention, which is a balustrade which servesas a non load bearing wall.

[0074]FIG. 30 is an external perspective view showing this thirdpreferred embodiment of the present invention, which is a balustradewhich serves as a non load bearing wall.

[0075]FIG. 31 is an external perspective view showing a fourth preferredembodiment of the present invention, which is a balustrade which servesas a non load bearing wall.

[0076]FIG. 32 shows a variant embodiment of the present invention, andparticularly shows the essential portions of a support construction fora non load bearing wall in an enlarged vertical sectional view.

[0077]FIG. 33 is a vertical sectional view showing one stage in aconventional construction method of a multi floor building.

[0078]FIG. 34 is a vertical sectional view showing a further stage inthis conventional construction method of a multi floor building.

[0079]FIG. 35 is a vertical sectional view showing a yet further stagein this conventional construction method of a multi floor building.

[0080]FIG. 36 is a vertical sectional view showing a yet further stagein this conventional construction method of a multi floor building.

[0081]FIG. 37 is a vertical sectional view showing a yet further stagein this conventional construction method of a multi floor building.

[0082]FIG. 38 is a vertical sectional view showing a yet further stagein this conventional construction method of a multi floor building.

[0083]FIG. 39 is an elevation view showing a yet further stage in thisconventional construction method of a multi floor building.

[0084]FIG. 40 is a vertical sectional view showing a yet further stagein this conventional construction method of a multi floor building.

[0085]FIG. 41 is an elevation view showing a yet further stage in thisconventional construction method of a multi floor building.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0086] The first preferred embodiment of the present invention will nowbe explained with reference to FIGS. 1 through 15.

[0087] It should be understood that the basic construction of the multifloor building according to this preferred embodiment of the presentinvention is the same as that of the prior art multi floor buildingwhich was shown in FIGS. 33 through 41 and described above. That is, theexplanation will be made in terms of showing a balustrade as an exampleof a non load bearing wall, and moreover in terms of application of thepresent invention to a multi floor building of which the first floorportion comprises a vacant portion which is to be utilized as a parkingarea or the like. It should be understood that the portions of thismulti floor building which are the same as ones of the prior art typemulti floor building previously described and which have the samefunctions will be denoted by the same reference symbols as in theprevious description, and their explanation will be curtailed.

[0088] First, before explaining the construction method of a multi floorbuilding according to this first preferred embodiment of the presentinvention, the structure of a balustrade, which is taken as an exampleof a non load bearing wall which is suitable for use in this process ofconstruction, will be explained with reference to FIG. 1.

[0089] In FIGS. 1 and 2 it is shown that the balustrades 20 according tothis first preferred embodiment of the present invention are ofapproximately the same height H for each of the floors of this multifloor building B. Furthermore, with, partway along their heightdirection, as shown in FIG. 3, there being provided the floor slabshuttering 3 for making the floor slab of the corresponding floor (thefloor in which the balustrades 20 is provided), so that each of thesebalustrades 20 includes a portion of this floor slab shuttering 3 in itsbasic structure. In contrast, FIGS. 1 and 2 show the subsequent state inwhich the floor slab S which is made by using this floor slab shuttering3 has been formed, and accordingly the floor slab shuttering 3 isarranged so as to surround the floor slab S.

[0090] To describe it in detail, the balustrade 20 is a balustrade whichis made of pre-cast concrete and which is made in advance in a factoryor the like, and a number of reinforcing bars (not shown in the figures)are embedded in its interior, so as to ensure that it has apredetermined desired strength.

[0091] Furthermore, as shown in FIGS. 1 through 3, in the balustrade 20,at the portion at which the floor slab shuttering 3 of the correspondingfloor is provided, there is formed a blind portion 21 which projects atleast in the upward direction from the floor slab S and which hides anupper portion of the outer edge portion of this floor slab S.Furthermore, at the lower portions at both ends in the widthwisedirection of this blind portion 21, there are formed respective joiningwall portions 22 which extend in the downwards direction from the floorslab S of this floor.

[0092] Each of these joining wall portions 22 is made, in cross section,in a rectangular shape, and both end portions of the blind portion 21which are connected to these two joining wall portions 22 are made to beof the same thickness as the thickness of these joining wall portions22, with two main reinforcement bars 23 which are embedded so as to passthrough from each of the joining wall portions 22 into and through eachof the end portions of the blind portion 21.

[0093] Furthermore, the positions of the blind portion 21 other thanthose which are connected to the joining wall portions 22 are made to bethin, and, in these thin portions there are formed a plurality of slits24, with the objectives of reducing the weight of the balustrade 20 andimproving lighting, and also of enlarging the field of view.

[0094] In the interior of each of the joining wall portions 22, at itslower portion, there are embedded a metallic sleeves 25 which arecoaxial with the respective main reinforcement bars 23. As describedhereinafter in detail with reference to FIGS. 4 and 5, the lower end ofeach metallic sleeve 25 opens at the lower edge surface of the joiningwall portion 22. Furthermore, in the upper end portion of each metallicsleeve 25, the lower end of each main reinforcement bar 23 is insertedfor a predetermined distance, and this main reinforcement bar 23 isconnected to the metallic sleeve 25 by welding or the like.

[0095] Furthermore, injection tubes 26 which connect and lead to theinteriors of these metallic sleeves 25 are fixed to a side wall of eachmetallic sleeve 25 at two positions which are spaced apart by a certaininterval in the axial direction of the metallic sleeves 25. Theseinjection tubes 26 project to the exterior of the joining wall portion22 from the side surface of the joining wall portion 22 which faces tothe interior of the building.

[0096] Furthermore, the end portions of the main reinforcement bars 23project at the upper ends of the blind portions 21 of this balustrade 20for a predetermined distance, and these projecting end portions of themain reinforcement bar 23 serve as connection reinforcement bars, so asto connect together the balustrade 20 of an upper floor and thebalustrade 20 of the lower floor.

[0097] In other words, when connecting together the balustrade 20 on anupper floor of the building and the balustrade 20 on the lower floor ofthe building, first, as shown in FIG. 5, the main reinforcement bars 23which project from the lower floor balustrade 20 are inserted by just apredetermined distance into the lower end portions of the metallicsleeves 25 which are embedded in the connecting foot portions 22 of thebalustrade 20 of the next upper floor portion of the building which isto be laid upon this lower floor portion thereof. Next, as shown in FIG.5 by the arrow signs, a high strength non-shrink mortar is poured intothe metallic sleeves 25, in order to serve as a grouting material, and,by this non-shrink mortar hardening, the main reinforcement bars 23 ofthe lower floor are connected to the main reinforcement bars 23 of theupper floor via the metallic sleeves 25, so that, as a result, thebalustrade 20 of the upper floor of the building and the balustrade 20of the lower floor of the building are mutually connected together.

[0098] Furthermore, a plurality of internal projections 25 a areprovided in the interior of the metallic sleeve 25, at roughly thecentral portion thereof in its longitudinal direction, spaced apart atintervals around its circumferential direction. These internalprojections 25 a, along with limiting the distance by which the mainreinforcement bars can enter thereinto, in other words the distance bywhich they are swallowed up therein. These internal projections 25 aalso regulate the dimensions of the joints 27 which are formed betweenthe balustrade 20 of the lower floor of the building and the balustrade20 of the upper floor of the building which are mutually joinedtogether.

[0099] In FIGS. 4 and 5, the reference symbol 28 denotes a spiralreinforcement member which is provided so as to surround each of themetallic sleeves 25. This spiral reinforcement member 28 increases thebonding strength between the metallic sleeve 25 and the concrete bybeing embedded in the concrete of the balustrades 20 and being unifiedin the concrete of the balustrades 20 along with the metallic sleeves25.

[0100] Furthermore, the reference symbols 29 in FIG. 3 denote connectionreinforcing bars which, when the floor slab shuttering 3 is built upupon the interior side of the balustrade 20 (the side of the main bodyof the building), project within this floor slab shuttering 3, and whichserve to connect and unify this balustrade 20 with the concrete for thefloor slab which is poured into this floor slab shuttering 3.

[0101] These connection reinforcing bars 29 are provided in largenumbers at a fixed interval apart along the widthwise direction of thebalustrade 20 at the portion thereof where thed floor slab shuttering isto be built up. Furthermore, the main portions of these connectionreinforcing bars 29 are connected to reinforcing bars (not shown in thefigures) which are provided within the balustrade 20 itself.

[0102] Next, the construction method of a multi floor building B using abalustrade 20 which has the above described structure will be explainedwith reference to FIGS. 6 through 15.

[0103] The multi floor building to which this preferred embodiment ofthe present invention is applied is the same as the previously describedprior art type multi floor building, in that a vacant portion P which isto be used as a parking space or the like is provided in the first floorportion of the building below the floor slab S1 for the lowestinhabitable floor of the building (on the second floor thereof).Furthermore balustrades 20, which function as the previously describednon load bearing walls, and which are made in a structure as describedabove from pre-cast concrete, are provided at both the edge portions ofthis floor slab S; and this construction is repeated in multiple layersupwards.

[0104] To describe the construction process in detail, first, as shownin. FIG. 6, the vacant portion P is defined by a plurality of columns 2and beams 7 laid upon a foundation 1, and by the floor slab S1 for thelowest floor of the building (its second floor) which is built uponthese columns 2 and beams 7.

[0105] And, as shown in FIGS. 6 and 7, living regions F are delimitedby, as shown in FIG. 6, erecting wall panels 4 which are made frompre-cast concrete as load bearing walls at the boundary portions betweenthese living regions F and passageways D and verandahs E.

[0106] Furthermore, balustrades 5 are erected at both the edges of thefloor slab S1, as shown in FIGS. 6 and 7, but these balustrades upon thelowest floor level are of the same structure as prior art typebalustrades; and, thus, the process of constructing the second floorportion of the building is completed by building these balustrades 5upon the upper sides of both the edges of the floor slab S1.

[0107] After having erected the wall panels 4 and the balustrades 5 uponthe floor slab S1 of the second floor portion of the building in thismanner, upon each of the balustrades 5, as shown in FIGS. 6 and 8, abalustrade 20 according to this first preferred embodiment of thepresent invention is lifted in order by a crane or the like and islowered into its predetermined position while adjusting its positionappropriately, and then these balustrades 20 are connected to thebalustrades 5 below them, as shown in FIG. 9, so as to erect thebalustrades 20 above the balustrades 5.

[0108] The connection together of one of the balustrades 5 and one ofthe balustrades 20 of this type is performed by pursuing the followingprocedure.

[0109] As shown in FIG. 4, after having mutually positionally adjustedthe lower balustrade 5 and the upper balustrade 20 so that each of themetallic sleeve 25 which are embedded in the lower portions of thejoining wall portions 22 of the upper balustrade 20 is positioned so asto be coaxial with each of the main reinforcement bars 23 which projectfrom the upper surface of the lower balustrade 5, the upper balustrade20 is lowered, and, as shown in FIG. 5, each of the main reinforcementbars 23 is inserted into the metallic sleeves 25, and thereby the lowerbalustrade 5 and the upper balustrade 20 are connected together.

[0110] Here, the amount by which the main reinforcement bars 23 of thelower balustrade 5 come to be inserted into the metallic sleeves 5, inother words the degree by which they extend into the metallic sleeves 5,is limited by the ends of the main reinforcement bars 23 coming intocontact with the internal projections 25 a which project inwards fromthe inner surfaces of the metallic sleeves 25.

[0111] As a result, a predetermined gap, in other words, a joint 27 iscreated between the lower balustrade 5 and the upper balustrade 20.

[0112] Next, a high strength non-shrink mortar is poured into themetallic sleeves 25 through the lower injection tubes 26, and thismortar flows into the gaps between the metallic sleeves 25 and the mainreinforcement bars 23 and fills them up, thereafter hardening.

[0113] By doing this, the main reinforcement bars 23 and the metallicsleeves 25 are fixedly connected together, and as a result thebalustrades 5 and 20 are fixedly connected together.

[0114] And, as for closing up the joint 27, this may be done either bycontinuing to pour the non-shrink mortar which is being poured into themetallic sleeves 25 up to and into the joint 27, or alternatively by,before joining the balustrades 5 and 20 together as described above,first piling up mortar spread upon the upper surface of the lowerbalustrade 5 where it is to mate with the upper balustrade 20.

[0115] Next, outer surface processing of the joint is performed, andthereby the work of finishing processing for the connection together ofthe balustrades 5 and 20 is completed.

[0116] Although this type of work for positionally adjusting therelative positions of the two balustrades 5 and 20, and the work ofmating them together, and the work of pouring the non-shrink mortar intothe metallic sleeves 25, is performed upon the floor slab S1,nevertheless, since the lower balustrade 5 is at this time erected uponthe side edge portion of this floor slab S1, therefore in practice theside edge of the floor slab S1, which is the working region, is closedoff by the balustrade 5. Accordingly the safety for the worker isimproved, and moreover, even if an object which falls upon the floorslab S1 rolls as far as the side edge portion of the floor slab S1, itstrikes against the balustrade 5, and accordingly is prevented fromfalling further downwards.

[0117] Furthermore, in this first preferred embodiment of the presentinvention, when performing the finishing work for the joint 27 betweenthe balustrades 5 and 20, since this joint 27 is at the level of theupper surface of the lower balustrade 5, the worker can perform the workfrom the inner side of the balustrade 5 in a very comfortable posture,without being required to assume any unreasonable attitude such asstooping or the like.

[0118] Moreover, during the finishing operation for this joint 27, theworker can perform the work in a situation in which they are protectedby the lower balustrade 5. Furthermore, since the width of the joint 27is short, it is possible to perform the work from the inner side of thebalustrade 5 at a range which can easily be reached by hand.Accordingly, a high level of safety is assured for the work.

[0119] After having erected the upper balustrades 20 upon thebalustrades 5 for the second floor portion of the building as describedabove, the floor slab shuttering 3 for the next higher floor (the thirdfloor portion of the building) is constructed on the inner side of thesebalustrades 20. In this case, before constructing this floor slabshuttering 3, as shown in FIG. 10, supports 30 are provided between saidbalustrades 20 and the floor slab S1 for the floor below, and therebythe balustrades 20 are supported so that they do not fall over.

[0120] These supports 30 are provided with the intention of supportingthe balustrades 20. However, in order to assure their function, theangle at which they are set with respect to the floor slab S1 becomesvery important. When an attempt is made to ensure that this settingangle is appropriate, it may happen that interference undesirably occursbetween the supports 30 and the wall panels 4 which are being erectedupon the interior portion of the floor slab S1. In this case, as shownin FIG. 10, this problem is solved by leading these supports 30 out tothe outsides of the wall panels 4 via opening portions which are formedin these wall panels 4 (such as opening portions which are provided forsetting windows or entrances and exits such as vestibules or the like).

[0121] Next, a large number of shoring members J are set up upon thefloor slab S1, and these shoring members J and the wall panels 4 whichhave already been erected serve as supporting members for making thefloor slab shuttering 3 for the next floor up (the third floor portionof the building), as shown in FIGS. 10 and 11.

[0122] Furthermore, with this floor slab shuttering 3, as shown in FIG.10, its side edge portions are made on the inside sides of the blindportions 21 of the balustrades 20, and as a result, the balustrades 20constitute a part of the floor slab shuttering 3.

[0123] Furthermore, according to requirements, the one end portions ofwires 31 may be fixed to the upper edge portions of the upperbalustrades 20, and the other end portions of these wires 31 may befixed to the floor slab S1 after they have passed through the floor slabshuttering 3, so that falling over of the balustrades 20 is positivelyprevented, or alternatively, as will be described hereinafter, deviationof the pouring pressure of the concrete which is poured into the floorslab shuttering 3 may be prevented.

[0124] Although these wires 31 are passed through the floor slabshuttering 3, as described above, since it is possible to providesleeves or the like at the positions of the floor slab shuttering wherethese wires 31 are required to pass through, and to remove the wires 31when concrete has been poured, so that the wires can be placed withoutexerting any influence upon the floor slab S2.

[0125] In addition, after having thus removed the wires, by closing upthe abovementioned sleeves with joint mortar or the like, it is possibleto rectify the external appearance of the floor slab S2.

[0126] Next, after having placed reinforcing bars (not particularlyshown in the figures) within the floor slab shuttering 3, by pouringconcrete into said floor slab shuttering 3 as shown in FIG. 37, thefloor slab S2 for the third floor portion of the building is constructedas shown in FIGS. 12 and 13.

[0127] After this, wall panels 4 are erected upon this floor slab S2 forthe third floor portion of the building which has been constructed, asshown in FIG. 14, and thereby the construction of the third floorportion of the building is completed.

[0128] In this case, joints of the order of size of a few centimetersare formed between neighboring ones of the balustrades 20 so as toextend along the vertical direction, and the concrete pouring spacewithin the floor slab shuttering 3 is communicated to the outsidethrough these joints. Accordingly, when the concrete is poured into thefloor slab shuttering 3, water of the concrete which has been pouredinto the floor slab shuttering 3 may leak out from these joint portions.To prevent this leakage of the water, it is desirable to insert asealing substance into these joint portions before pouring the concrete.

[0129] Furthermore, positional deviation of the balustrade 20 whichconstitutes a portion of the floor slab shuttering 3 due to the pouringpressure of the concrete or the like when the concrete for the floorslab S2 for the upper floor is poured in this way is prevented, sincethe balustrade 20 is supported by the supports 30, or by the wires 31which are put into place according to requirements, as has beenmentioned above.

[0130] Yet further, as shown in FIGS. 14 and 15, after having againconstructed further layer of floor slab shuttering 3, the floor slab S3for the fourth floor portion of the building is constructed upon thefloor slab S2 for the third floor portion of the building by pouringconcrete according to the method shown in FIGS. 10 and 11. Andthereafter these identical processes are repeated in sequence, the multifloor building is constructed.

[0131] Also, during the construction of the floor slab shuttering 3 foreach floor, for the work of making the lower portions of the floor slabshuttering 3, the blind portions 21 of the balustrades 20 are erected inthe upwards direction at the edges of the floor slab S which is theworking region; and furthermore, even for the work of erecting the upperportions of the floor slab shuttering 3 and for the work of insertingreinforcing bars into the floor slab shuttering 3, the blind portions 21of the balustrades 20 are erected from its side edge portions upwards.Accordingly, the blind portions 21 of these balustrades 20 constituteprotective fences, so that not only are objects prevented from fallingover the edge of the floor slab S and down the exterior of the building,but also the safety of the workers while they are working and also whilethey are moving about is positively assured.

[0132] Furthermore, since the previously described treadboards are abovethe floor slab S for the floor below or are above the shuttering for theabove, the ease of working is also enhanced by ensuring that the workingregion is wide.

[0133] Moreover, due to the use of the balustrades 20 as parts of thefloor slab shuttering 3, the work of assembling framing at the edges ofthe floor slab S becomes unnecessary.

[0134] In addition according to the present invention as describedabove, the remaining work for each floor becomes work within the mainbody of the building, therefore the constructional scaffolding which wasrequired in the prior art to be put into place outside the main body ofthe building becomes unnecessary with the present invention. As aresult, the work of putting this constructional scaffolding into placeand the work of removing it after use become unnecessary, theprobability of occurrence of accidents is greatly reduced, and moreover,the overall cost of construction is reduced. Furthermore, since noconstructional scaffolding is required, the countermeasures which areneeded in the workplace during high winds become extremely simple.

[0135] In this construction, the supports 30 and the wires 31 whichsupport the balustrades 20 may also use the wall panels 4 which areerected upon the floor slab S for the lower floor, as the portions towhich their inner end portions are fixed, rather than the floor slab Sas previously described.

[0136] Next, a second preferred embodiment of the present invention willbe explained with reference to FIGS. 16 through 21.

[0137] The reference symbol 40 in this figures denotes a balustradeaccording to this second preferred embodiment of the present invention.With this balustrade 40, the end portion of each of the joining wallportions 22 which are provided as connecting to the lower portions ofthe blind portions 21 is made as a connecting block 41 which is formedas a separate unit. Furthermore, the upper and lower balustrades 40 aremutually connected together via these connecting blocks 41. The reasonwhy this type of structure is adopted is as follows.

[0138] That is, it is necessary to transport the balustrades 20, whichhave been produced in a factory, to the place where the multi floorbuilding B is being erected by a truck or the like. However, when aspreviously described the height of the balustrades 20 is matched to theheight of each floor of the building, it may happen that this height ofthe balustrades 20 exceeds the maximum height specified by law of theload which the truck can carry, which creates a problem with regard todelivery of the balustrades 20.

[0139] Accordingly, in this second preferred embodiment of the presentinvention, the height of the balustrades 20 when they are beingtransported upon a truck is restricted by segmenting the joining wallportions in the vertical direction. Accordingly, the height of theconnecting blocks 41 is set in relation to the height of each floor ofthe multi floor building B, and also in relation to the maximum heightspecified by law of the load which the truck can carry.

[0140] To explain this in more detail, in this second preferredembodiment of the present invention, at both of the end portions in thewidthwise direction of the balustrades 40, there are provided the twomain reinforcement bars 23 which extend in the vertical direction andwhich are parallel to one another, and each of these main reinforcementbars 23 constitutes a connection reinforcing bar which projects by apredetermined distance from the lower end of the joining wall portion 22and from the upper end of the blind portion 21.

[0141] In the interior of each of these connecting blocks 41, there areprovided a pair of metallic sleeves 25 which are identical to themetallic sleeves 25 which were shown and described above with respect tothe first preferred embodiment of the present invention. As shown inFIG. 18, these metallic sleeves 25 are embedded within each connectingblocks 41 so as to extend parallel with one another and so as to open tothe upper and lower sides of the connecting blocks 41; and spiralreinforcement member 28 is provided so as to surround the outercircumferential portion of each of these metallic sleeves 25.

[0142] Furthermore, internal projections 25a are provided at the centralinternal circumferential portions in the longitudinal direction of eachof these metallic sleeves 25, and moreover, to the side wall of each ofthe metallic sleeves 25, there are fixed a pair of injection tubes 26which are connected to the internal space within the metallic sleeve 25and which are spaced apart from one another in the longitudinaldirection by a certain interval. These injection tubes 26 are projectedto the exterior of the connecting block 41, and the connecting block 41is fitted to the building in an orientation in which these injectiontubes 26 point towards the interior of the building.

[0143] In this second preferred embodiment of the present invention, asshown in FIG. 16, the connecting blocks 41 are laid upon the lowerbalustrade 40 (or 5), and then further the upper balustrade 40 is laidover these connecting blocks 41, and these members are then allconnected together. The state in which the balustrades 40 have beenbuilt up as far as the fourth floor portion of the building is shown inFIG. 17.

[0144] To describe the method for connecting together the various floorsin detail, as shown in FIG. 18, the connecting blocks 41 are lowereddown after they have been positionally adjusted so that their metallicsleeves 25 become coaxial with the main reinforcement bars 23 of thelower balustrade 40 (or 5), and thereby these main reinforcement bars 23are inserted into the metallic sleeves 25 from below.

[0145] Next, the upper balustrade 40 is lowered down after having beenpositionally adjusted so that its main reinforcement bars 23 whichproject downwards from it become coaxial with the metallic sleeves 25 ofthe connecting blocks 41, and thereby these main reinforcement bars 23are inserted into the metallic sleeves 25 from above.

[0146] In this setting up work, the relative positions of the variousmembers are limited by the ends of the main reinforcement bars 23 cominginto contact with the internal projections 25 a within the metallicsleeves 25, and, as shown in FIG. 19, joints 27 are thereby created,each with a predetermined interval between its mutually confrontingsurfaces.

[0147] Next, a high strength non-shrink mortar is injected into theinteriors of the metallic sleeves 25 via the lower injection tubes 26.When this non-shrink mortar has hardened, the upper and lowerbalustrades 40 (or 5) are connected together via the metallic sleeves 25and the various main reinforcement bars 23 while sandwiching theconnecting blocks 41 between them.

[0148] After this, a procedure is performed for finishing the joints 27.During this finishing. procedure, as shown in FIG. 19, ring shapedpackings 42 may be inserted into the joint portions 27, and then thenon-shrink mortar may be injected from the injection tubes 26 into theirinteriors so as to fill them up; or, alternatively, mortar may be heapedup in advance and spread out, and then, after having performed themating together of the balustrades 40 (or 5) and the connecting blocks41, processing may be performed upon the spread out mortar which hasbeen squeezed out; or, again, mortar may be piled up upon the sillsinside the packings 42, and this spread out mortar may be prevented bythe packings 42 from being squeezed out to the outside when thebalustrades 40 (or 5) and the connecting blocks 41 are connectedtogether.

[0149] It should be understood that, as shown in FIG. 20, the connectingblocks 41 may formed roughly in the shape of square cones or prisms; oralternatively, as shown in FIG. 21, it is also possible to provide thebenefit of providing a decorative design by attaching rounded portionsto the side portions of the connecting blocks 41.

[0150] A variation of the above described second preferred embodiment ofthe present invention will now be explained with reference to FIGS. 22through 25.

[0151] With this embodiment, through holes 44 are formed in theconnecting blocks 43 so as to extend in the vertical direction, and themain reinforcement bars 23 which are provided to the lower balustrade 40(or 5) project upwards from the upper edge of this balustrade 40 (5) bya relatively longer than in the previous embodiment described andillustrated above, i.e. longer than the height corresponding to that ofthe connecting blocks 43. Furthermore, the metallic sleeves 25 areembedded in the lower end portions of the joining wall portions 22 ofthe upper balustrade 40.

[0152] The connection together of the upper and lower balustrades 40 (or5) and the connecting blocks 43 is performed, in this variant embodimentof the present invention, by the following procedure.

[0153] First, as shown in FIG. 24, the connecting blocks 43 are set upupon the lower balustrade 40 (or 5) while passing the main reinforcementbars 23 which project from the lower balustrade 40 through their throughholes 44 from below. Furthermore, spread mortar is heaped up upon thelower balustrade 40 at its portions where it mates together with theconnecting blocks 43.

[0154] At this time, in the state in which the connecting blocks 43 arethus positioned upon the lower balustrade 40 (or 5), the mainreinforcement bars 23 which project upwards from the upper portion ofthe lower balustrade 40 are passing through the holes in the connectingblocks 43 and are projecting upwards from these connecting blocks 43.And, according to requirements, mortar is poured into the through holes44 in the connecting blocks 43, so as to fill up the gaps between thesethrough holes 4 and the main reinforcement bars 23.

[0155] Next, as shown in FIG. 25, the upper balustrade 40 is set up uponthe connecting blocks 43 while inserting the main reinforcement bars 23which are projecting upwards from the connecting blocks 23 into themetallic sleeves 25 which are fitted in the lower edge portion of saidupper balustrade 40. Furthermore, according to requirements, theconnecting blocks 43 and the upper balustrade 40 may be mated togetherafter mortar has been piled up and spread out upon the upper surface ofthe connecting blocks 43, which are the elements which are positionedbelow the upper balustrade 40, before erecting this upper balustrade 40in the above described manner.

[0156] Furthermore, as shown by the arrow sign in FIG. 25, the upper andlower balustrades 40 and the connecting blocks 43 are mutually connectedtogether by the high strength non-shrink mortar being injected throughthe lower ones of the injection tubes 26 into the metallic sleeves 25and hardening therein.

[0157] With the previously described connecting blocks 41 in which themetallic sleeves 25 were embedded, their heights were limited by theheights of the metallic sleeves 25 due to problems during construction.In contrast, in this embodiment, by employing a structure as shown inFIG. 25, there is the beneficial aspect that the restriction due to themetallic sleeves 25 disappears, and the freedom by which the height maybe set is increased.

[0158] Next, FIGS. 26 through 28 are examples of a method ofconstruction for one of the connecting blocks 43 shown in FIG. 22.

[0159] With this constructional method, a tubular block 45 whose crosssectional shape is rectangular is used; this tubular block 45 is setupon a base plate X, metallic pipes 46 are set in predeterminedpositions within this tubular block 45, and concrete 47 is poured inbetween these metallic pipes 46 and the tubular block 45, so thatthereby the metallic pipes 46 and the tubular block 45 are fixedtogether into one unit.

[0160] As a variation upon this type of constructional method for theconnecting blocks 43, it is possible to employ a structure that themetallic pipes 46 can be removed. In this structure, connecting blockswhich are only made of concrete, as shown in FIG. 22, can be obtained.

[0161]FIGS. 29 and 30 show a third preferred embodiment of the presentinvention.

[0162] The balustrade 50 of this third preferred embodiment of thepresent invention is the same as the balustrades 20, 40 shown above withreference to the above described preferred embodiments, except for thefact that the blind portion 21 is improved in the aspect that, as shownin FIG. 29, an opening 51 is formed in the central portion of this blindportion 21, and, within this opening 51, as shown in FIG. 30, there isfitted a grating 52 which is made of aluminum alloy or a composite resinmaterial.

[0163] The grating 52 may be fitted within the opening 51 by any ofvarious methods, such as by fitting it after the main portion of thebalustrade 50 has been made using a fixing tool, or alternatively bysetting it in the shuttering which is used for making the main portionof the balustrade 50 so that it is connected into one unit with theblind portion 21 when the concrete is poured into this shuttering, orthe like.

[0164] The balustrade 50 according to this third preferred embodiment ofthe present invention is one which has been improved based upon theobjective of aiming to make the blind portion 21 lighter, since it is aportion in which the weight is concentrated, and based upon theobjective of making the opening area of the balustrade portion larger soas to enlarge the field of view from the passageway D or the verandah E,and based upon the objective of improving the quality of the lightingwhich is admitted to the building, or the like.

[0165] Furthermore, FIG. 31 shows a fourth preferred embodiment of thepresent invention.

[0166] The balustrade of this fourth preferred embodiment of the presentinvention, which is designated in the figures by the reference symbol60, is one in which the positional relationship of the blind portions 41and the joining wall portions 22 is vertically reversed.

[0167] By adopting this type of structure, the portions in which theweight is concentrated are shifted downwards, so that it is possible toenhance the safety of this balustrade 60.

[0168] It should be understood that, with the various preferredembodiments described above, the actual forms in which the variousstructural elements are implemented, and their dimensions, are onlyshown by way of example, and it would be possible to make variouschanges and alterations, as appropriate based upon design requirements.

[0169] For example although, in the various above described preferredembodiments of the present invention, the use of the wires 31 asprevention members for preventing the balustrades 20 leaning over andfalling during the pouring of the concrete for the floor slabs is shownby way of example, instead of this arrangement, it would also bepossible, as shown in FIG. 32, to perform the task of supporting thebalustrades 20 by connecting connection reinforcing bars 29 which areprovided so as to project to the inward sides of the balustrades 20 toreinforcing bars 70 for the floor slab S which have been assembled tothe floor slab shuttering 3 by spot welding or the like.

[0170] Furthermore, as shown in FIGS. 12 and 13, it would also bepossible, after having erected the balustrades 20, to fit protectivenets N to the inner sides of these balustrades 20, so as to cover overthe space between the various joining wall portions 22 which constituteopen portions. These protective nets N may be fitted to the inner sidesof the balustrades 20 by various fixing methods, such as by hooks, or byropes which are threaded through slits 24 positioned below in thebalustrade 20, or the like.

[0171] The openings in the balustrades 20 are reduced to the utmostextent possible by providing these protective nets N, so that it ispossible to enhance the safety of the workplace by yet a further level.

What is claimed is:
 1. A construction method of multi floor buildingwhich comprises floor slabs which define each floor of the multi floorbuilding, and non load bearing walls made from pre-cast concrete whichare erected upon edge portions of the floor slabs, wherein said non loadbearing walls are formed of a height which is roughly equal to a heightof each floor of said multi floor building, and, after having erectedsaid non load bearing wall for an upper floor upon said non lead bearingwall which has been erected upon the floor slab for a lower floor, afloor slab shuttering for the upper floor is built at an inner side ofsaid non load bearing wall for the upper floor and at a partway in thevertical direction of said non load bearing wall for the upper floor,with said non load bearing wall serving as a portion of the shuttering,and concrete is poured within said floor slab shuttering so as toconstruct the floor slab for the upper floor of the building.
 2. Aconstruction method of multi floor building as described in claim 1,wherein a load bearing walls are erected upon said floor slab for thelower floor so as to define rooms upon the lower floor, before erectingsaid non load bearing wall for the upper floor.
 3. A construction methodof multi floor building as described in claim 1, wherein connectionreinforcing bars which project into said floor slab shuttering for theupper floor are provided to said non load bearing wall for the upperfloor, and said non load bearing wall for the upper floor and said floorslab for the upper floor are joined together by embedding theseconnection reinforcing bars in the concrete which is poured into saidfloor slab shuttering for the upper floor.
 4. A construction method ofmulti floor building as described in claim 1, wherein, at a joiningportion between the upper and lower non load bearing walls, a metallicsleeve which extends along a direction of their mutual connection isambedded within either one of these non load bearing walls, and aconnection reinforcing bar which is inserted into said metallic sleeveis projected into the other one of these non load bearing walls; andwherein the upper and lower non load bearing walls are connectedtogether by, after having inserted the connection reinforcing bar intosaid metallic sleeve, filling grouting material into the metallic sleeveand allowing it to harden.
 5. A construction method of multi floorbuilding as described in claim 1, wherein, said non load bearing wallfor the upper floor which constitutes a portion of said floor slabshuttering for the upper floor is connected to a structural elementwhich is positioned on an inner side thereof, before pouring concreteinto said floor slab shuttering for the upper floor.
 6. A constructionmethod of multi floor building as described in claim 5, wherein saidstructural element is said floor slab for the lower floor.
 7. Aconstruction method of multi floor building as described in claim 5,wherein said structural element is a load bearing wall which is erectedupon said floor slab for the lower floor.
 8. A construction method ofmulti floor building as described in claim 1, wherein said non loadbearing wall is a balustrade.
 9. A non load bearing wall of multi floorbuilding; wherein the non load bearing wall is made from pre-castconcrete and is erected at an outer edge portion of a floor slab of saidmulti floor building; and wherein the non load bearing has a heightroughly equal to the height of each floor of said multi floor building,a floor slab shuttering for the corresponding floor is built at theinner side of said non load bearing wall and at a partway in thevertical direction of said non load bearing wall, and said non loadbearing wall constitutes a portion of said floor slab shuttering.
 10. Anon load bearing wall of multi floor building as described in claim 9,wherein a blind portion which hides the upper portion of the outer edgeportion of said floor slab, projects at least upward from said floorslab at the portion where said floor slab shuttering for thecorresponding floor.
 11. A non load bearing wall of multi floor buildingas described in claim 10, wherein joining wall portions which extend inthe downward direction of said floor slab are formed at the lowerportions of both the ends in widthwise direction of said blind portion.12. A non load bearing wall of multi floor building as described inclaim 10, wherein joining wall portions which extend in the upwarddirection from said blind portions are formed at the upper portions ofboth the ends in the widthwise direction of said blind portion. joiningwall portions which extend in the upward direction from said blindportions are formed at the upper portions of both the ends in thewidthwise direction of said blind portion.
 13. A non load bearing wallof multi floor building as described in claim 11, wherein a connectingblock for joining together the upper and lower non load bearing walls isprovided by dividing each of said joining wall portions in the verticaldirection.
 14. A non load bearing wall of multi floor building asdescribed in claim 12, wherein a connecting block for joining togetherthe upper and lower non load bearing walls is provided by dividing eachof said joining wall portions in the vertical direction.
 15. A non loadbearing wall of multi floor building as described in claim 9, whereinsaid non load bearing wall is a balustrade.